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at reactor number 4. meantime, let's put this into context for you. tim tremendous van trevan former weapons inspector. reactor number 4 as we have described, help us understand what this means. how to contain it and this means for what it means for potential for radiation release? >> as you have been hearing, two sets of nuclear material that we have to worry about. the nuclear material inside the reactors and the nuclear waste material which is in the cooling pool. this fire is in the cooling pool which you said already is not inside the containment structure which can deal with pressure and with shielding radiation. so the fear if this fire continues and continues to spew up a cloud of steam, that steam will contain particulate matter of items like eye -- iodine and -- these are materials which are highly radioactive. and so will be a continuing source of radio activity once they are deposited away from the site. and they will be contaminated the land around it the one thing to look for if they cannot get this fire under control by getting water on it, is to see how high up this steam clo
. i want to go to tim trevan joining us live. he is a former u.n. weapons inspector. explain to you if you what this means. >> they are having real problems getting water into the reactor to cool down the rods. and we have had that confirmed by them saying that so much of the fuel rod is now exposed. what they exposure means is that the temperature in the fuel rods is going to rise and that increases the risk first of the fuel rod itself melting which complicates the problem of cooling it down even further and secondly it increase the risk maybe more catastrophic failure of the containment so far. >> tim, we have gotten reports now from the news agency and from the japanese government that there appear to be radiation level increases around that facility and concerns of a crack in the outer containment dome. help us understand that. >> well, there would be some rise in the radiation from the steam that's been vented earlier. if they're indicating that it's from the immediate vicinity, what that could be an indication of is that it is now not just irradiated steam that's being releas
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